diff --git a/include/fmt/core.h b/include/fmt/core.h
index 0ae61d64..bcce2f50 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -16,7 +16,7 @@
 #include <type_traits>
 
 // The fmt library version in the form major * 10000 + minor * 100 + patch.
-#define FMT_VERSION 50301
+#define FMT_VERSION 60000
 
 #ifdef __has_feature
 #  define FMT_HAS_FEATURE(x) __has_feature(x)
@@ -144,12 +144,12 @@
 #    define FMT_INLINE_NAMESPACE namespace
 #    define FMT_END_NAMESPACE \
       }                       \
-      using namespace v5;     \
+      using namespace v6;     \
       }
 #  endif
 #  define FMT_BEGIN_NAMESPACE \
     namespace fmt {           \
-    FMT_INLINE_NAMESPACE v5 {
+    FMT_INLINE_NAMESPACE v6 {
 #endif
 
 #if !defined(FMT_HEADER_ONLY) && defined(_WIN32)
@@ -389,7 +389,7 @@ constexpr basic_string_view<typename S::char_type> to_string_view(const S& s) {
 
 namespace internal {
 void to_string_view(...);
-using fmt::v5::to_string_view;
+using fmt::v6::to_string_view;
 
 // Specifies whether S is a string type convertible to fmt::basic_string_view.
 // It should be a constexpr function but MSVC 2017 fails to compile it in